27688728778720 has 48 divisors (see below), whose sum is σ = 65565694933200. Its totient is φ = 11049912981504.

The previous prime is 27688728778699. The next prime is 27688728778729. The reversal of 27688728778720 is 2787782788672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27688728778729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199762770 + ... + 199901329.

It is an arithmetic number, because the mean of its divisors is an integer number (1365951977775).

Almost surely, 2^{27688728778720} is an apocalyptic number.

27688728778720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27688728778720 is an abundant number, since it is smaller than the sum of its proper divisors (37876966154480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27688728778720 is a wasteful number, since it uses less digits than its factorization.

27688728778720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399664547 (or 399664539 counting only the distinct ones).

The product of its (nonzero) digits is 3304390656, while the sum is 79.

The spelling of 27688728778720 in words is "twenty-seven trillion, six hundred eighty-eight billion, seven hundred twenty-eight million, seven hundred seventy-eight thousand, seven hundred twenty".